Solve
1/3x +1/5 = 1/15
a) -1
b) -4/5
c) -3/5
d) -2/5
e) 0
f) None of the above.
2007-06-20 09:24:14 · 6 answers · asked by Alex T 2 in Science & Mathematics ➔ Mathematics
D) -2/5
1/3x + 1/5 = 1/15 (common denominator is 15 so you must multiply 3x by 5, 5 by 3 and 15 by 1, you get:)
5/15x + 3/15 = 1/15
5/x + 3 = 1
5/x = 1-3
x= -2/5
2007-06-20 09:39:45 · answer #1 · answered by JohnyPT 2 · 0⤊ 0⤋
1/3x +1/5 = 1/15 Do you mean:
(1/3)x+1/5=1/15 multiply both sides by 15
5x+3=1 subtract 3 from each side
5x=-2 divide both sides by 5
x=-2/5=-0.4
d) -2/5 is correct
or did you mean:
1/(3x)+1/5=1/15 multiply both sides by 15x
5+3x=x subtract 5 from each side
3x=x-5 subtract x from each side
2x=-5 divide both sides by 2
x=-5/2=-2.5
None of the above so I assume you meant the first 1.
2007-06-20 16:31:43 · answer #2 · answered by yupchagee 7 · 0⤊ 0⤋
d) -2/5
2007-06-20 16:29:47 · answer #3 · answered by dip 2 · 0⤊ 0⤋
the answer is -2/5
2007-06-20 16:45:00 · answer #4 · answered by Anonymous · 0⤊ 0⤋
common denominator is 15
thus, 5x + 3 = 1
5x = 1 - 3 = -2
x = - (2/5)
D.
2007-06-20 16:33:19 · answer #5 · answered by Feb 3 · 0⤊ 0⤋
d
2007-06-20 16:27:55 · answer #6 · answered by csmithballsout 4 · 0⤊ 0⤋